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问题 解答题

小王昨天卖出两台洗衣机，每台都是819元卖出的，其中一台比进价高30%，另一台比进价低30%，小王卖出这两台洗衣机是不赔不赚吗？

答案

819÷（1+30%）=630（元），819÷（1-30%）=1170（元），819×2<630+1170，所以卖出这两台洗衣机后赔了。

选择题

—Where ____ they from?

—They’re from China.[ ]

A. is

B. am

C. are
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单项选择题

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication, TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocolis to create a  (2) and error-control mechanism at the transport level. TCP uses a sliding(3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve(4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends  (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

空白（2）处应选择（）

A.procedure

B.function

C.route

D.flow
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